CN108809133A - A kind of active neutral-point-clamped five-electrical level inverter capacitor voltage balance control method - Google Patents
A kind of active neutral-point-clamped five-electrical level inverter capacitor voltage balance control method Download PDFInfo
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- CN108809133A CN108809133A CN201810470450.5A CN201810470450A CN108809133A CN 108809133 A CN108809133 A CN 108809133A CN 201810470450 A CN201810470450 A CN 201810470450A CN 108809133 A CN108809133 A CN 108809133A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of active neutral-point-clamped five-electrical level inverter capacitor voltage balance control methods, active neutral-point-clamped five-electrical level inverter includes Support Capacitor C1, Support Capacitor C2, four input side bridge arms and two outlet side bridge arms, each input side bridge arm and each outlet side bridge arm include two semiconductor switch devices, it is supported the balance control of capacitance voltage to active neutral-point-clamped five-electrical level inverter, obtains residual voltage；The balance control that flying capacitor voltage is carried out to active neutral-point-clamped five-electrical level inverter, obtains redundant state action time adjusted value dx；Assisted modulation wave is obtained according to residual voltage and redundant state action time adjusted value dx.
Description
Technical field
The invention belongs to power technique fields, and in particular to a kind of capacitance voltage of active neutral-point-clamped five-electrical level inverter
Balance control technology.
Background technology
Continuous with high-power application is popularized, and is limited to the voltage class of current semiconductor switch device, passes through
It is an effective method that more level outputs, which improve output voltage grade, therefore multi-electrical level inverter is increasingly by industry
The concern on boundary and scholars, although having there is lot of documents to describe relevant achievement in research, really have practical value and
Success realizes that the topological structure of commercial applications is extremely limited, includes mainly diode clamp bit-type, striding capacitance type, cascaded H-bridges
Type, modular multilevel topology.Five level of active neutral-point-clamped (Active Neutral Point clamp five-level
Topology, ANPC-5L) it was proposed by ABB researcher in 2005, and it has been successfully applied to the ACS2000 of ABB AB
Series of products, therefore the practicality has already passed through inspection.It is opened up compared to diode clamp topology, striding capacitance topology, cascaded H-bridges
The advantage for flutterring ANPC-5L topologys is：Three-phase general DC busbar reduces DC source quantity, can be operated in back-to-back side
Formula；Topological structure is relatively easy, and control is relatively easy to；Remain the advantage of diode clamp bit-type topology.Therefore active midpoint pincers
Position five-electrical level inverter has good application prospect.
Almost to the inverter of all three level or more, capacitor voltage balance control is all the emphasis of research, current two
Pole pipe clamper topology, the capacitor voltage balance control technology of striding capacitance topology, cascaded H-bridges topology and modular multilevel topology
It is more mature but also less to the research of ANPC-5L topologys.Although ABB AB has released the business production of ANPC-5L
Product, but its capacitor voltage balance control method is trade secret, and realization method is unknown, at present about ANPC-5L inversions
There are following problems for the research of device capacitor voltage balance control：First, currently based on the Support Capacitor electricity of injected zero-sequence voltage
Voltage-controlled system can cause excessive common-mode voltage, this will generate harmful effect to the load motor service life；Second is that at present to flying capacitor
The balance control of voltage is mainly by detecting voltage and current, to select different Redundanter schalter states, but this control
Mode is a kind of qualitative rather than quantitative control, and it is excessive to be easy to cause flying capacitor voltage fluctuation, and can lose phase shift carrier modulation
The advantages of self-balancing；Third, do not organically combine Support Capacitor voltage balancing control and flying capacitor voltage balancing control, this
It is also at present to most important problem existing for the research of ANPC-5L topologys.In fact, the balance of Support Capacitor voltage and the electricity that suspends
The balance for holding voltage intercouples, and flying capacitor voltage balancing control is improper will to influence Support Capacitor voltage balancing control effect
Fruit.
Invention content：
In order to overcome the defect of above-mentioned background technology, the present invention to provide a kind of active neutral-point-clamped five-electrical level inverter capacitance
Voltage balancing control method, it is by introducing assisted modulation wave, the control of Support Capacitor voltage and the control of flying capacitor voltage is organic
In conjunction with effectively controlling active neutral-point-clamped five-electrical level inverter ANPC-5L capacitor voltage balances.
In order to solve the above-mentioned technical problem used technical solution of the invention is：
A kind of active neutral-point-clamped five-electrical level inverter capacitor voltage balance control method, five level of active neutral-point-clamped are inverse
It includes Support Capacitor C1, Support Capacitor C2, four input side bridge arms and two outlet side bridge arms to become device, each input side bridge arm and
Each outlet side bridge arm includes two semiconductor switch devices, and capacitance is supported to active neutral-point-clamped five-electrical level inverter
The balance of voltage controls, and obtains residual voltage；The balance of flying capacitor voltage is carried out to active neutral-point-clamped five-electrical level inverter
Control, obtains redundant state action time adjusted value dx；It is obtained according to residual voltage and redundant state action time adjusted value dx
Assisted modulation wave.
Preferably, the balance for being supported capacitance voltage to active neutral-point-clamped five-electrical level inverter controls, zero sequence is obtained
The specific method of voltage includes：
Step 1.1, it according to the difference of two Support Capacitor voltage, obtains and is used for balanced support capacitance in a carrier cycle
The ideal median average electric current of voltage
Step 1.2, the voltage of Support Capacitor, the range with reference voltage in level section are controlled by injecting residual voltage
Premised on interior, the range [U of residual voltage is obtainedzmin,Uzmax]；
Step 1.3, according to three-phase voltage median UmidPolarity and residual voltage range, calculate median average electricity
Flow range
Step 1.4, according to ideal median average electric currentWith median average current rangeRelationship with
And residual voltage range [Uzmin,Uzmax], acquisition makes median average electric currentClosest to ideal median average electric currentZero
Sequence voltage Uz。
Preferably, the balance for carrying out flying capacitor voltage to active neutral-point-clamped five-electrical level inverter controls, redundancy is obtained
The specific method of state action time adjusted value includes：
Step 2.1, according to the deviation of flying capacitor voltage, the average current value for neutral buoyancy capacitance voltage is obtained
Step 2.2, the duty ratio of one of the first outlet side bridge arm semiconductor switch device is added into a redundancy
The duty ratio of another semiconductor switch device of the outlet side bridge arm is subtracted a redundancy by state action time adjusted value dx
State action time adjusted value dx, is limited with carrier amplitude, obtains the value range of redundant state action time adjusted value dx；
Step 2.3, by average current valueThe calculating resulting value after negative is taken to make with twice of the practical ratio for measuring electric current
For redundant state action time adjusted value dx, if calculating the value model that resulting value exceeds redundant state action time adjusted value dx
It encloses, then using the maximum value of value range or minimum value as redundant state action time adjusted value dx.
Preferably, obtaining the specific method of assisted modulation wave according to residual voltage and redundant state action time adjusted value dx
Including：
Two assisted modulation waves
Wherein, UrefxTo modulate wave amplitude.
The beneficial effects of the present invention are：The flying capacitor balance of voltage, optimization are controlled using the method for injected zero-sequence voltage
The generation of residual voltage, prevents excessively high common-mode voltage；It is carried out by the action time to Redundanter schalter state accurate
Adjustment realizes the quantitative control to flying capacitor voltage, prevents flying capacitor voltage fluctuation excessive；By introducing assisted modulation
The control of the balance of Support Capacitor voltage balancing control and flying capacitor voltage is combined, realizes to ANPC-5L inverters institute by wave
There is the balance of capacitance voltage to control.
Description of the drawings
Fig. 1 is the single-phase topology diagram of five level of active neutral-point-clamped.
Fig. 2 is the active five level ANPC-5L inverter three-phase topology diagrams of neutral-point-clamped of the embodiment of the present invention.
Fig. 3 is the active five level ANPC-5L inverter switching states of neutral-point-clamped of the embodiment of the present invention and corresponding output.
Fig. 4 is active five level ANPC-5L inverter phase-shifting carrier waves of the neutral-point-clamped modulation figure of the embodiment of the present invention.
The active five level ANPC-5L inverters of neutral-point-clamped of Fig. 5 embodiment of the present invention introduce assisted modulation wave the latter and carry
Modulation figure in wave period.
In figure：1- the first input side bridge arms, 2- the second input side bridge arms, 3- third input side bridge arms, the 4th input sides of 4-
Bridge arm, 5- the first outlet side bridge arms, 6- the second outlet side bridge arms.
Specific implementation mode
A kind of active neutral-point-clamped five-electrical level inverter capacitor voltage balance control method, five level of active neutral-point-clamped are inverse
It includes Support Capacitor C1, Support Capacitor C2, four input side bridge arms and two outlet side bridge arms to become device, each input side bridge arm and
Each outlet side bridge arm includes two semiconductor switch devices, and control method includes：
Step 1, the balance that capacitance voltage is supported to active neutral-point-clamped five-electrical level inverter controls, and obtains zero sequence electricity
Pressure, specific method include：
Step 1.1, it according to the difference of two Support Capacitor voltage, obtains and is used for balanced support capacitance in a carrier cycle
The ideal median average electric current of voltage
Step 1.2, by injecting the voltage of residual voltage control Support Capacitor, it is not change reference voltage level section
Premise obtains the range [U of residual voltagezmin,Uzmax]；
Step 1.3, according to three-phase voltage median UmidPolarity and residual voltage range, calculate median average electricity
Flow range
Step 1.4, according to ideal median average electric currentWith median average current rangeRelationship with
And residual voltage range [Uzmin,Uzmax], acquisition makes median average electric currentClosest to ideal median average electric currentZero
Sequence voltage Uz。
Step 2, the balance that flying capacitor voltage is carried out to active neutral-point-clamped five-electrical level inverter controls, and obtains redundancy shape
State action time adjusted value dx, specific method include：
Step 2.1, according to the deviation of flying capacitor voltage, the average current value for neutral buoyancy capacitance voltage is obtained
Step 2.2, the duty ratio of one of the first outlet side bridge arm semiconductor switch device is added into a redundancy
The duty ratio of another semiconductor switch device of the outlet side bridge arm is subtracted a redundancy by state action time adjusted value dx
State action time adjusted value dx, is limited with carrier amplitude, obtains the value range of redundant state action time adjusted value dx；
Step 2.3, by average current valueThe calculating resulting value after negative is taken to make with twice of the practical ratio for measuring electric current
For redundant state action time adjusted value dx, if calculating the value model that resulting value exceeds redundant state action time adjusted value dx
It encloses, then using the maximum value of value range or minimum value as redundant state action time adjusted value dx.
Step 3, assisted modulation wave, specific method packet are obtained according to residual voltage and redundant state action time adjusted value dx
It includes：
Two assisted modulation waves
Wherein, UrefxTo modulate wave amplitude.
The present invention is described further with reference to the accompanying drawings and examples.
As shown in Figure 1, the single-phase topologys of the active neutral-point-clamped five-electrical level inverter ANPC-5L of the present embodiment include 6 bridges
Arm：First input side bridge arm, the second input side bridge arm, the defeated input side bridge arm of third, the 4th input side bridge arm, the first outlet side bridge
Arm and the second outlet side bridge arm, each bridge arm include respectively two semiconductor switch devices.The present embodiment includes that active midpoint is clamped
The A of position five-electrical level inverter ANPC-5L, B, C three-phases indicate with x, per mutually totally 12 semiconductor switch devices, respectively Sx1-
Sx6And its corresponding complementary switching devices S'x1-S'x6.In addition every mutually to have 1 flying capacitor Cfx.DC source DC, Support Capacitor C1
It is shared for three-phase with C2, as shown in Fig. 2, ANPC-5L inverters are three phase full bridge structure.If DC source voltage is 4E, prop up
Support capacitance voltage is 2E, and flying capacitor voltage is E.ANPC-5L on off states, output and current relationship are as shown in figure 3, partly lead
Body switching device Sx1-Sx4And its complementary switch pipe S'x1-S'x4It is operated in fundamental frequency, when output is timing, Sx1-Sx4All it is 1, i.e.,
It opens, when output voltage is negative, Sx1-Sx4All it is 0, that is, closes.Therefore, for ANPC-5L inverters, it is only necessary to control
The semiconductor switch device S of one outlet side bridge arm 5x5And Sx6And their complementary switching devices, i.e. the second outlet side bridge arm 6
Semiconductor switch device S'x5And S'x6.When therefore using phase shift carrier modulation, it is only necessary to two groups of triangular carrier UC5With UC6, such as Fig. 4
It is shown.As shown in figure 3, ANPC-5L includes 8 on off states and 5 kinds of output levels altogether, wherein output E and-E has two kinds
On off state, respectively St2, St3 and St6, St7, both on off state output voltages are identical, but to flying capacitor voltage
It influences on the contrary, therefore, according to flying capacitor voltage deviation value and current direction, the accurate action time for adjusting redundant state,
The balance control to flying capacitor voltage may be implemented.On the basis of voltage E, by the output reference voltage U of x phasesxoIt is mapped to area
Between [- 2,2], then modulating wave is mapped to section [0,1], then the modulating wave U of x phasesrefxIt can be expressed as：
As shown in Figure 1, busbar voltage remains constant, following voltage-current relationship formula can be obtained：
Electric current to flow through capacitance C1 and C2 can be expressed as：
Wherein inFor midpoint electric current.From formula (3) it can be seen that the electric current for flowing through capacitance C1 and C2 is determined by midpoint electric current,
Therefore, Support Capacitor voltage has close relationship with midpoint electric current, by controlling midpoint electric current, can control Support Capacitor
Voltage.Support Capacitor and flying capacitor voltage decoupling are controlled, then combined the two by assisted modulation wave, therefore capacitance voltage
Balance control can be divided into three big steps and carry out：
The first step：The balance of Support Capacitor voltage controls, and is divided into 4 small step and carries out.
1, ideal midpoint electric current is calculated, busbar voltage is 4E and remains constant, and the voltage of Support Capacitor C1 is Uc1, the electricity of C2
Pressure is Uc2, then Uc1+Uc2=4E, capacitance voltage deviation value are dUc=2E-Uc1=Uc2- 2E, according to formula (3) and the electricity of capacitance
Piezoelectricity flow relation, in a carrier cycle, the ideal median average electric current for balanced support capacitance voltage is
Wherein, T is carrier wave Uc5With Uc6Period, C be Support Capacitor C1 and C2 capacitance.
2, residual voltage range is calculated, according to fig. 3, midpoint electric current can be expressed as：
Wherein Sx5=1 indicates semiconductor switch device Sx5It opens, Sx5=0 indicates semiconductor switch device Sx5It closes.One
In a carrier cycle, as shown in Figure 4, Sx5Duty ratio dSx5=Urefx.Therefore, according to formula (1) and (5), in a carrier cycle
In phase, when only considering a phase, midpoint current average is expressed as
If in voltage UoxOne residual voltage U of middle additionz, then new midpoint current average is for three-phase system, total midpoint current average isFor three-phase
Three-wire system has iao+ibo+ico=0, so midpoint current average is after residual voltage is added, midpoint electricity
The average value of stream is changed, and therefore, can change midpoint electric current by the way that different residual voltages is added, to control support
Capacitance voltage.After residual voltage is added, common-mode voltage Umod={ (Uao+Uz)+(Ubo+Uz)+(Uco+Uz)/3, in order not to generate
High common-mode voltage, the voltage class section of reference voltage cannot be changed by limiting the residual voltage of addition.So residual voltage is most
Big value and minimum value are：
Wherein ceil () is the function that rounds up, and floor () is downward bracket function.
3, the range of midpoint electric current after residual voltage is added is calculated.Enable three-phase voltage Uao, Ubo, UcoMiddle maximum value is Umax,
Corresponding current i1, median Umid, corresponding electric current is i2, minimum value electric current is Umin, corresponding current i3, it was determined that
Umax>0 and Umin<0, and UmidSize be uncertain, it is therefore desirable to discuss in two kinds of situation：
If a) Umid>0, then midpoint current average new after residual voltage is added in step 2 isAccording to the range of residual voltage,Most
Big value and minimum value are：
Wherein
If b) Umid≤ 0, then midpoint current average new after residual voltage is added in step 2 is Maximum value and minimum value be：
Wherein
4, residual voltage is calculated.According toRange andSize, a points of three kinds situations calculate the zero sequence electricity of injection
Pressure：
If a)So residual voltage is：
If b)So residual voltage is：
If c)So residual voltage is：
WhereinIt indicates to be added without the midpoint in the case of residual voltage
Electric current.
Second step：The balance of flying capacitor voltage controls, and is divided into 3 small step and carries out.
1, it calculates and is used for the required electric current of neutral buoyancy capacitance voltage.As can be seen from FIG. 3, the electric current of flying capacitor is flowed through
It can be expressed as：
ifx=(Sx6-Sx5)ixo (13)
Wherein ixoElectric current is measured to be practical.Sx6Meaning and Sx5It is similar, work as Sx6When=1, semiconductor switch device S is indicatedx6
It opens, Sx6It indicates to close when=0.As shown in Figure 4, in a carrier cycle, Sx6=1 duty ratio dSx6=Urefx, therefore
In a carrier cycle, flying capacitor C is flowed throughfxCurrent average be：
Due to dSx5=Urefx, dSx6=Urefx, thereforeTheoretically 0, but due to the presence of error and non-linear factor,
Flying capacitor voltage will produce certain deviation, and inverter longtime running may be unbalance, it is therefore necessary to flying capacitor voltage
It is controlled.Flying capacitor voltage rating is E, and voltage deviation value is dUfx=Ufx- E, then in a carrier cycle, root
According to the voltage-current relationship of capacitance, the ideal current average value for neutral buoyancy capacitance voltage is：
Wherein CfFor flying capacitor capacitance.
2, computing redundancy state action time adjusted value dx ranges.By the 1st step analysis of the second largest step it is found that can incite somebody to action
dSx5In addition a dx is simultaneously by dSx6A dx is subtracted to adjust dSx5With dSx6, but modulating wave UrefxAmplitude no more than carry
Wave amplitude 1, and the residual voltage U being calculated in conjunction with the first stepz, dx is ranging from：
3, dx is calculated.After introducing dx, dSx5-dSx6=2dx, according to formula (14) and (15) it is found that neutral buoyancy electricity
Hold voltage, then the desired value dx of dxoptFollowing relationship need to be met
According to formula (15), formula (16) and formula (17), the value of dx is determined：
Third walks：Calculate assisted modulation wave.What the residual voltage and second step being calculated according to the first step were calculated
Dx introduces two assisted modulation waves：
As shown in figure 5, passing through assisted modulation wave Urefx1With carrier wave Uc5It compares and generates pwm pulse to control the first output
The semiconductor switch device S of side bridge arm 5x5And its complementary switching devices S'x5.Pass through Urefx2With carrier wave Uc6It compares and generates PWM
Pulse exports the semiconductor switch device S of the first outlet side bridge arm 5 to controlx6And its complementary switching devices S'x6。
Due to be added residual voltage will not change inverter output line voltage, as long as introduce dx will not change it is defeated
Go out voltage, then assisted modulation wave would not change the output voltage of inverter.It can be proved that dx will not change output electricity
Pressure.As shown in Figure 5, it is believed that in a carrier cycle internal modulation wave be a steady state value, with (Urefx+Uz/ 2) ∈ [0,0.5] is
Example, after dx is added, the duty ratio of output voltage E and 0 does not change, and only changes the duty of on off state St2 and St3
Than since St2 and St3 outputs are E, after dx is added, not influenced on the output voltage of inverter.It can be proved that
When output is other situations, dx, which is added, will not change output voltage.In conclusion residual voltage and dx do not interfere with inversion
Device output line voltage.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (4)
1. a kind of active neutral-point-clamped five-electrical level inverter capacitor voltage balance control method, five level of active neutral-point-clamped
Inverter includes Support Capacitor C1, Support Capacitor C2, four input side bridge arms and two outlet side bridge arms, each input side
Bridge arm and each outlet side bridge arm include two semiconductor switch devices, it is characterised in that：To active neutral-point-clamped five
Electrical level inverter is supported the balance control of capacitance voltage, obtains residual voltage；It is inverse to five level of active neutral-point-clamped
Become the balance control that device carries out flying capacitor voltage, obtains redundant state action time adjusted value dx；According to the residual voltage
Assisted modulation wave is obtained with the redundant state action time adjusted value dx.
2. a kind of active neutral-point-clamped five-electrical level inverter capacitor voltage balance control method according to claim 1,
It is characterized in that, the balance that capacitance voltage is supported to active neutral-point-clamped five-electrical level inverter controls, and obtains zero sequence electricity
The specific method of pressure includes：
Step 1.1, it according to the difference of two Support Capacitor voltage, obtains and is used for balanced support capacitance voltage in a carrier cycle
Ideal median average electric current
Step 1.2, by injecting the voltage of residual voltage control Support Capacitor, it is in the range of level section with reference voltage
Premise obtains the range [U of residual voltagezmin,Uzmax]；
Step 1.3, according to three-phase voltage median UmidPolarity and residual voltage range, calculate median average electric current model
It encloses
Step 1.4, according to the ideal median average electric currentWith the median average current rangePass
System and residual voltage range [Uzmin,Uzmax], acquisition makes median average electric currentClosest to the ideal median average electric currentResidual voltage Uz。
3. a kind of active neutral-point-clamped five-electrical level inverter capacitor voltage balance control method according to claim 2,
It is characterized in that, the balance that flying capacitor voltage is carried out to the active neutral-point-clamped five-electrical level inverter controls, and obtains redundancy shape
The specific method of state action time adjusted value includes：
Step 2.1, according to the deviation of flying capacitor voltage, the average current value for neutral buoyancy capacitance voltage is obtained
Step 2.2, the duty ratio of one of the first outlet side bridge arm semiconductor switch device is added into a redundant state
The duty ratio of another semiconductor switch device of the outlet side bridge arm is subtracted a redundant state by action time adjusted value dx
Action time adjusted value dx, is limited with carrier amplitude, obtains the value range of redundant state action time adjusted value dx；
Step 2.3, by the average current valueThe calculating resulting value after negative is taken to make with twice of the practical ratio for measuring electric current
For redundant state action time adjusted value dx, if the resulting value that calculates is beyond the redundant state action time adjusted value dx
Value range, then using the maximum value of the value range or minimum value as redundant state action time adjusted value dx.
4. a kind of active neutral-point-clamped five-electrical level inverter capacitor voltage balance control method according to claim 2,
It is characterized in that, it is described to obtain the tool of assisted modulation wave according to the residual voltage and the redundant state action time adjusted value dx
Body method includes：
Two assisted modulation waves
Wherein, UrefxTo modulate wave amplitude.
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| CN110299861A (en) * | 2019-08-02 | 2019-10-01 | 江苏固德威电源科技股份有限公司 | Boost active neutral-point-clamped type five-level converter |
| CN110912397A (en) * | 2019-11-22 | 2020-03-24 | 深圳供电局有限公司 | Direct current transformer and control method thereof |
| CN111245271A (en) * | 2020-01-18 | 2020-06-05 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and dead zone effect suppression method |
| CN111342690A (en) * | 2020-03-13 | 2020-06-26 | 南京理工大学 | Split capacitor power unit multilevel converter and modulation strategy thereof |
| WO2021092720A1 (en) * | 2019-11-11 | 2021-05-20 | Abb Schweiz Ag | Multi-level power convertor and method for multi-level power convertor |
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| CN110299861A (en) * | 2019-08-02 | 2019-10-01 | 江苏固德威电源科技股份有限公司 | Boost active neutral-point-clamped type five-level converter |
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| CN110912397A (en) * | 2019-11-22 | 2020-03-24 | 深圳供电局有限公司 | Direct current transformer and control method thereof |
| CN110912397B (en) * | 2019-11-22 | 2021-02-09 | 深圳供电局有限公司 | Direct current transformer and control method thereof |
| CN111245271A (en) * | 2020-01-18 | 2020-06-05 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and dead zone effect suppression method |
| CN111342690B (en) * | 2020-03-13 | 2021-09-03 | 南京理工大学 | Modulation method of split capacitor power unit multilevel converter |
| CN111342690A (en) * | 2020-03-13 | 2020-06-26 | 南京理工大学 | Split capacitor power unit multilevel converter and modulation strategy thereof |
| CN113037111A (en) * | 2021-02-25 | 2021-06-25 | 安徽大学绿色产业创新研究院 | Space vector modulation method for current transformer |
| CN113037111B (en) * | 2021-02-25 | 2022-05-31 | 安徽大学绿色产业创新研究院 | Space vector modulation method for current transformer |
| CN113395003A (en) * | 2021-03-24 | 2021-09-14 | 中国人民解放军海军工程大学 | Multi-level active neutral point clamped inverter series IGBT voltage-sharing circuit |
| CN113098306A (en) * | 2021-03-30 | 2021-07-09 | 北京交通大学 | Modulation control method for five-level and multi-level laminated multi-unit converter |
| CN113098306B (en) * | 2021-03-30 | 2022-06-17 | 北京交通大学 | Modulation control method for five-level and multi-level laminated multi-unit converter |
| CN113422520A (en) * | 2021-07-06 | 2021-09-21 | 中南大学 | Modulation method for eliminating common-mode voltage of three-phase back-to-back three-level inverter |
| CN113422520B (en) * | 2021-07-06 | 2022-08-26 | 中南大学 | Modulation method for eliminating common-mode voltage of three-phase back-to-back three-level inverter |
| CN113783451A (en) * | 2021-09-13 | 2021-12-10 | 新疆大学 | Optimal control method of multi-section zero-sequence voltage approaching HANPC multi-level converter |
| CN113783451B (en) * | 2021-09-13 | 2023-06-30 | 新疆大学 | Optimal control method of multi-section zero sequence voltage approximation HANPC multi-level converter |
| CN116722762A (en) * | 2023-05-19 | 2023-09-08 | 燕山大学 | Model predictive control-based flying capacitor grid-connected inverter control method |
| CN116722762B (en) * | 2023-05-19 | 2023-12-15 | 燕山大学 | Model predictive control-based flying capacitor grid-connected inverter control method |
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